feat(minor): Exporter specific configurations

[CrownedPhoenix]

Description

A series of refactors that culminate in enabling exporter specific configurations to be provided at benchmark initialization.

This is intended to support a use case like the following.

for n in [10, 100, 1000] {
    let x = Double.random(in: 0.0...100.0)
    Benchmark("Foo", configuration: .init(
        tags: ["n": String(n), "x": String(x)],
        exportConfigurations: [
            .influx: InfluxExportConfiguration(
                fields: ["x": .double]
            )
        ]
    )) { _ in
        foo(n, x)
    }
}

This PR is more easily reviewed by commit.

How Has This Been Tested?

I manually tested the exporter csv against an instance of Influx using Influx Data Explorer and querying a raw csv.
I followed instructions listed here

Minimal checklist:

• I have performed a self-review of my own code
• I have added DocC code-level documentation for any public interfaces exported by the package
• I have added unit and/or integration tests that prove my fix is effective or that my feature works

[CrownedPhoenix]

Would like some feedback on how/whether we'd prefer to do unit and/or integration tests for this feature.

[codecov]

Codecov Report

Attention: Patch coverage is 9.75610% with 37 lines in your changes missing coverage. Please review.

Project coverage is 70.75%. Comparing base (51fffb6) to head (b354858).

Files with missing lines	Patch %	Lines
...tConfigurations/BenchmarkExportConfiguration.swift	8.11%	34 Missing ⚠️
...portConfigurations/InfluxExportConfiguration.swift	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #286      +/-   ##
==========================================
- Coverage   71.41%   70.75%   -0.66%     
==========================================
  Files          32       34       +2     
  Lines        3791     3832      +41     
==========================================
+ Hits         2707     2711       +4     
- Misses       1084     1121      +37     

Files with missing lines	Coverage Δ
Sources/Benchmark/Benchmark.swift	70.91% <100.00%> (+0.18%)	⬆️
...portConfigurations/InfluxExportConfiguration.swift	0.00% <0.00%> (ø)
...tConfigurations/BenchmarkExportConfiguration.swift	8.11% <8.11%> (ø)

Files with missing lines	Coverage Δ
Sources/Benchmark/Benchmark.swift	70.91% <100.00%> (+0.18%)	⬆️
...portConfigurations/InfluxExportConfiguration.swift	0.00% <0.00%> (ø)
...tConfigurations/BenchmarkExportConfiguration.swift	8.11% <8.11%> (ø)

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[hassila]

Apologies for very late feedback, currently no bandwidth but will revert asap.